Phenotypic heterogeneity and genetic modification of P102L inherited prion disease in an international series. by Webb, T, Poulter, M, Beck, J, Uphill, J, Adamson, G, Campbell, T, Linehan, J, Powell, C, Brandner, S, Pal, S, Siddique, D, Wadsworth, J, Joiner, S, Alner, K, Petersen, C, Hampson, S, Rhymes, C, Treacy, C, Storey, E, Geschwind, MD, Nemeth, A, Wroe, S, Collinge, J, Mead, S